RECORDING HEAD AND DISK DEVICE INCLUDING THE SAME
A recording head includes a main magnetic pole generating a recording magnetic field in a direction perpendicular to a recording medium, a write shield magnetic pole facing a trailing side of the main magnetic pole, a recording coil exciting a magnetic flux in a magnetic circuit, and a spin torque oscillator provided between the main magnetic pole and the write shield magnetic pole. The main magnetic pole includes a trailing side end surface that faces the spin torque oscillator and is tilted toward a leading side of the recording head with respect to the direction perpendicular to the recording medium, and the spin torque oscillator has layers with tilted surfaces that are substantially in parallel with the trailing side end surface.
This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-120207, filed on May 25, 2012; the entire contents of (if multiple applications, all of) which are incorporated herein by reference.
FIELDEmbodiments described herein relate to a recording head for perpendicular magnetic recording which is used for a disk device, and a disk device including the recording head.
BACKGROUNDA disk device, for example a magnetic disk device, includes a magnetic disk, a spindle motor, and a magnetic head. The magnetic disk is disposed in a case. The spindle motor supports and rotationally drives the magnetic disk. The magnetic head reads/writes data to/from the magnetic disk. The magnetic head has a slider attached to a suspension, and a head part provided in the slider. The head part is configured with a recording head for writing and a reproducing head for reading.
In recent years, a magnetic head for perpendicular magnetic recording has been proposed to further increase the recording density and capacity of the magnetic disk device and reduce the size thereof. In a magnetic head of this type, a recording head has a main magnetic pole, a write shield magnetic pole, and a coil. The main magnetic pole generates a perpendicular magnetic field. The write shield magnetic pole is arranged on a trailing side of the main magnetic pole with a write gap interposed between the main magnetic pole and the write shield magnetic pole, and closes a magnetic path between the magnetic disk and the write shield. The coil serves to pass a magnetic flux through the main magnetic pole. In addition, a high frequency assist head has been proposed in which a high frequency oscillator, for example a spin torque oscillator, is provided between a medium side end part of the write shield magnetic pole and the main magnetic pole and a current flows to the high frequency oscillator through the main magnetic pole and the write shield magnetic pole.
In the magnetic head mentioned above, the spin torque oscillator that is provided between the main magnetic pole and the write magnetic shield pole is provided in parallel to the film growth direction. That is, the spin torque oscillator is provided substantially perpendicular to an air bearing surface (ABS) of the magnetic head. When the spin torque oscillator oscillates, a high-frequency magnetic field (c-Hac) is generated as a leakage magnetic field from the spin torque oscillator. Due to the direction of rotation magnetization of the spin torque oscillator, the rotation direction of a c-Hac generated on a main magnetic pole facing side of the spin torque oscillator is opposite to the rotation direction of a c-Hac generated on the write shield magnetic pole facing side of the spin torque oscillator. Due to the rotation directions of the c-Hacs, the c-Hac generated on the main magnetic pole side works to make favorable a state of a disk recording layer that depends on the magnetic field from the main magnetic pole, which is known as magnetization reversal state.
A recording head disclosed herein includes a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer of a recording medium, a write shield magnetic pole that faces a trailing side of the main magnetic pole through a write gap interposed therebetween, a recording coil that excites a magnetic flux in a magnetic circuit formed by the main magnetic pole and the write shield magnetic pole, and a spin torque oscillator that is provided between a tip part of the main magnetic pole on the recording medium side and the write shield magnetic pole and that generates a high frequency magnetic field. The tip part of the main magnetic pole includes a trailing side end surface facing the spin torque oscillator, the trailing side end surface that forms an oblique angle with respect to the direction perpendicular to the recording layer of the recording medium, and the spin torque oscillator is arranged with one or more layers having surfaces that are substantially in parallel with the trailing side end surface.
Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings.
First EmbodimentOn the base 10a, a magnetic disk 12 as a recording medium and a mechanism part are provided. The mechanism part includes a spindle motor 13, a plurality of (for example, two) magnetic heads 33, a head actuator 14, and a voice coil motor (hereinafter, referred to as VCM) 16. The spindle motor 13 supports and rotates the magnetic disk 12. The magnetic heads 33 record information to and reproduce information from the magnetic disk 12. The head actuator 14 supports the magnetic heads 33 in a movable manner with respect to surfaces of the magnetic disk 12. The VCM 16 revolves and positions the head actuator. On the base 10a, a ramp load mechanism 18, a latch mechanism 20, and a board unit 17 are provided. The ramp load mechanism 18 holds the magnetic heads 33 at positions distanced from the magnetic disk 12 when the magnetic heads 33 are moved to an outermost periphery of the magnetic disk 12. The latch mechanism 20 holds the head actuator 14 at an evacuation position when the HDD is affected by a jolt and the like. The board unit 17 has electronic components such as a preamplifier, a head integrated circuit (IC), and the like mounted thereon.
A control circuit board 25 is screwed on an outer surface of the base 10a, and is positioned facing a bottom wall of the base 10a. The control circuit board 25 controls the operations of the spindle motor 13, the VCM 16, and the magnetic heads 33 via the substrate unit 17.
As illustrated in
The head actuator 14 includes a bearing part 21 and a plurality of arms 27. The bearing part 21 is fixed on the bottom wall of the base 10a. The arms 27 extend from the bearing part 21. The arms 27 are positioned in parallel to the surfaces of the magnetic disk 12 and at intervals therebetween, and extend in the same direction from the bearing part 21. The head actuator 14 includes elastically deformable suspensions 30 each in the shape of an elongated plate. Each suspension 30 is configured with a plate spring and has a proximal end fixed to a distal end of its corresponding arm 27 by spot welding or adhesion. Each suspension 30 extends from its corresponding arm. Each suspension 30 may be formed with its corresponding arm 27 in an integrated manner. At an end of the extended part of each suspension 30, its corresponding magnetic head 33 is supported. Each arm 27 and its corresponding suspension 30 configure a head suspension, and the head suspension and its corresponding magnetic head 33 configure a head suspension assembly.
As illustrated in
Each magnetic head 33 is electrically connected to a main flexible printed circuit (FPC) 38, which is described below, via a relay flexible printed circuit board (hereinafter, referred to as relay FPC) 35 fixed on the suspension 30 and the arm 27.
As illustrated in
The VCM 16 has a supporting frame (not illustrated) extending from the bearing part 21 toward a direction opposite to the arms 27, and a voice coil supported by the supporting frame. In a state where the head actuator 14 is incorporated in the base 10a, the voice coil is positioned between a pair of yokes 34 fixed on the base 10a, and configures the VCM 16 with the yokes and a magnet fixed to the yokes.
By passing a current to the voice coil of the VCM 16 in a state where the magnetic disk 12 is rotating, the head actuator 14 revolves, and the magnetic head 33 is moved to and positioned on a desired track of the magnetic disk 12. In the embodiment described herein, the magnetic head 33 is moved along a radial direction of the magnetic disk 12 between an inner periphery edge part and an outer periphery edge part of the magnetic disk 12.
Next, detail descriptions of configurations of the magnetic disk 12 and the magnetic head 33 are given.
As illustrated in
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The slider 42 has a rectangular-shaped air bearing surface (ABS) 43 facing the surface of the magnetic disk 12. The slider 42 flies due to an air flow C generated between the disk surface and the ABS 43 by rotation of the magnetic disk 12. The direction of the air flow C is identical to a rotation direction B of the magnetic disk 12. The slider 42 is arranged so that a longitudinal direction of the ABS 43 is substantially identical to the direction of the air flow C with respect to the surface of the magnetic disk 12.
The slider 42 has a leading end 42a positioned in an inflow side of the air flow C and a trailing end 42b positioned in the outflow side of the air flow C. On the ABS 43 of the slider 42, a leading step, a trailing step, a side step, a negative pressure cavity, and the like (not shown) are formed.
As illustrated in
The reproducing head 54 is configured with a magnetic film 55 having a magneto-resistive effect, and shield films 56 and 57 arranged so as to sandwich the magnetic film 55 from a trailing side and a leading side of the magnetic film. Bottom ends of the magnetic film 55 and the shield films 56 and 57 are exposed to the ABS 43 of the slider 42.
The recording head 58 is provided on the trailing end 42b side of the slider 42 with respect to the reproducing head 54.
As illustrated in
An electrically insulating layer 61 is arranged on the junction part 67 of the main magnetic pole 60 and the write shield magnetic pole 62. Thereby, the main magnetic pole and the write shield magnetic pole are insulated each other. The main magnetic pole 60 and the write shield magnetic pole 62 are respectively electrically connected to drive terminal electrodes 63. A current circuit is configured such that a current is passed in series from these drive terminal electrodes 63 through the main magnetic pole 60, the spin torque oscillator 65, and the write shield magnetic pole 62. Thereby, the write shield magnetic pole 62 and the main magnetic pole 60 function as electrodes that perpendicularly pass a current to the spin torque oscillator 65.
The recording coil 70 is, for example, wound around the junction part 67 between the main magnetic pole 60 and the write shield magnetic pole 62. A current supplied from a power supply (not shown) to the recording coil 70 is controlled by the control circuit board 25 (control part) of the HDD. A predetermined current is supplied to the recording coil 70 from the power supply for writing signals to the magnetic disk 12, which causes a magnetic flux to flow to the main magnetic pole 60 and generates a magnetic field.
As illustrated in
The write shield magnetic pole 62 is formed substantially in an L-shape. A tip part 62a of the write shield magnetic pole 62 has an elongated rectangular shape. A tip surface of the write shield magnetic pole 62 is exposed to the ABS 43 of the slider 42. A leading side end surface 62b of the tip part 62a extends along the track width direction of the magnetic disk 12. This leading side end surface 62b faces the trailing side end surface 60b of the main magnetic pole 60 in parallel through the write gap WG interposed therebetween.
As illustrated in
The spin torque oscillator 65 is configured by laminating an under layer, a spin injection layer (second magnetic body layer) 65a, an intermediate layer, an oscillation layer (first magnetic body layer) 65b, and a cap layer in this order from the main magnetic pole 60 side toward the trailing shield 62 side.
The trailing side end surface 60b of the tip part 60a of the main magnetic pole 60 is tilted toward a head leading side with respect to a direction that is perpendicular to the recording layer of the magnetic disk 12. That is, the trailing side end surface 60b has a tilt of angle θ towards the head leading side with respect to a direction perpendicular to the ABS 43.
The spin torque oscillator 65 faces the trailing side end surface 60b and is arranged so as to be in parallel with the trailing side end surface 60b. Thereby, the spin injection layer 65a, the oscillation layer 65b and the other layers of the spin torque oscillator 65 each have a tilt of an angle θ toward the head leading side with respect to the direction perpendicular to the ABS 43. Note that the end surface of the spin torque oscillator 65 on the ABS side is formed in parallel with and in the same plane as the ABS 43.
The write shield magnetic pole 62 has the leading side end surface 62b facing the spin torque oscillator 65. The leading side end surface 62b is tilted toward the head leading side with respect to the direction perpendicular to the recording layer of the magnetic disk 12. That is, the leading side end surface 62b has a tilt of an angle θ toward the head leading side with respect to the direction perpendicular to the ABS 43. Thereby, the leading side end surface 62b is positioned substantially in parallel with the spin torque oscillator 65.
In addition, in the present embodiment, the tip part 60a of the main magnetic pole 60 has a leading side end surface 60c that is positioned on an opposite side of the trailing side end surface 60b. The leading side end surface 60c is tilted toward the head leading side with respect to the direction perpendicular to the recording layer of the magnetic disk 12. That is, the leading side end surface 60c is tilted toward the head leading side with respect to the direction perpendicular to the ABS 43.
When the magnetic head is mounted in the magnetic disk device, in order to reduce a fringe magnetic field that deteriorates records of an adjacent track by adjusting a skew angle, a pole length is designed to have a length of 50 nm to 100 nm. The pole length is a length in a head moving direction on the ABS 43 of the main magnetic pole 60. In addition, to ensure a magnetic field intensity at which a recording state of the recording layer in the magnetic disk 12 is favorable, a thickness of the main magnetic pole 60 on the deep side (side extended away from the ABS in a height direction) is preferably increased. Accordingly, the main magnetic pole 60 is preferably configured so as to have a taper on the head leading side end surface 60c to narrow the thickness of the main magnetic pole toward the ABS 43.
As illustrated in
The manufacturing processes of the recording head 58 configured as described above will be explained.
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According to the HDD configured as described above, the head actuator 14 revolves by driving the VCM 16, and the magnetic head 33 is moved to and is positioned on an intended track of the magnetic disk 12. Moreover, the magnetic head 33 flies by the air flow C generated between the disk surface and the ABS 43 by the rotation of the magnetic disk 12. During the operation of the HDD, the ABS 43 of the slider 42 faces the disk surface maintaining a gap therebetween. As illustrated in
During writing of information, the main magnetic pole 60 is excited by the recording coil 70, and a recording magnetic field in a perpendicular direction is applied from the main magnetic pole to the recording layer 103 of the magnetic disk 12 positioned directly under the main magnetic pole. Therefore, information is recorded in the recording layer 103 at a desired track.
At this time, as illustrated in
An intensity of each component of the high-frequency magnetic field c-Hac that generated from the spin torque oscillator 65 was calculated and plotted on the
As mentioned above, the high-frequency magnetic field c-Hac (Pos) that generated from the spin torque oscillator 65 increases as the high-frequency magnetic field c-Hac (Neg) generated from the spin torque oscillator 65 decreases. Thereby, the quality of signals that are recorded in a recording medium is improved. As a result, an increase in recording density is realized.
It has been understood that a gap magnetic field of approximately 7800 (Oe) is needed in order to cause the spin torque oscillator 65 to oscillate. The main magnetic pole 60 needs to be parallel with the spin torque oscillator 65 to ensure the intensity of the gap magnetic field. It will be understood that in the first embodiment discussed above, in a case of the tilt angle θ>45°, the spin torque oscillator does not oscillate when the intensity of the gap magnetic field is lower than the intensity necessary to oscillate, so that the bit error rate is not improved.
The results mentioned above indicate that when the tilt angles θ of the trailing side end surface of the main magnetic pole 60 and the spin torque oscillator are within the range of 0<θ≦45°, the high-frequency magnetic field c-Hac (Pos) increases as the high-frequency magnetic field c-Hac (Neg) decreases with the gap magnetic field maintained. Thereby, the deterioration of the information of the recording layer 103 is suppressed and the quality of signals that are recorded to a recording medium is improved. As a result, the increase in the recording density is realized.
The spin torque oscillator 65 was oscillated at the oscillation frequencies of 24 GHz, 28 GHz, and 36 GHz, and signal outputs of respective recording patterns for the oscillation frequencies when the writing to the magnetic disk was performed were calculated. An increase (%) of signal output for the case where the spin torque oscillator 65 oscillates with respect to the case where the spin torque oscillator 65 does not oscillate was set as an assist gain. The difference between the assist gain of the magnetic head according to the present embodiment and the assist gain of the magnetic head according to the comparative example was defined as an assist improvement degree (%). The assist improvement degrees of a plurality of oscillation frequencies were plotted. The improvement of the assist gain of 10 through 15% is indicated in the magnetic head according to the present embodiment with respect to the magnetic head according to the comparative example in the region of the oscillation frequencies mentioned above.
In the recording head of the HDD according to the present embodiment, the deterioration of the record signals is suppressed due to the decrease in the high-frequency magnetic field c-Hac (Neg). Thereby, the quality of signals that are recorded to a recording medium is improved. As a result, the recording head and the HDD including the recording head that can achieve an increase in the recording density are obtained.
Next, descriptions regarding HDDs and magnetic heads according to other embodiments are given. Note, in the following description of the various embodiments, the same reference numbers are given to portions that are the same as the corresponding portions of the above-described first embodiment and its detailed descriptions are omitted.
Second EmbodimentNext, descriptions regarding a recording head of an HDD according to a second embodiment are given.
A configuration of a recording head 58 of the HDD according to the second embodiment is mainly different from that of the recording head according to the first embodiment in that the recording head 58 according to the second embodiment further includes a leading shield magnetic pole. Other configurations thereof are the same as those of the recording head according to the first embodiment. The same reference numbers are given to portions that are the same in the first embodiment and their detailed descriptions are omitted.
As illustrated in
The spin torque oscillator 65 is arranged between the tip part of the main magnetic pole 60 and the tip part of the write shield magnetic pole 62. These are configured in the same manner as in the first embodiment discussed above.
The leading shield magnetic pole 72 is formed substantially in an L-shape. A tip part 72a of the leading shield magnetic pole 72 has an elongated rectangular shape. A tip surface of the leading shield magnetic pole 72 is exposed to the ABS 43 of the slider 42. A trailing side end surface 72b of the tip part 72a faces the leading side end surface 60c of the main magnetic pole 60 through a gap interposed therebetween.
Electrically insulating layers 61 and 75 are respectively arranged on the junction part 67 between the main magnetic pole 60 and the write shield magnetic pole 62 and on the junction part 73 between the main magnetic pole 60 and the leading shield magnetic pole 72. Thereby, the main magnetic pole 60 and the write shield magnetic pole 62, and the main magnetic pole 60 and the leading shield magnetic pole 72 are respectively insulated from each other. Parts of the main magnetic pole 60 and the write shield magnetic pole 62 are respectively electrically connected to the drive terminal electrodes 63.
In the second embodiment configured as mentioned above, the deterioration of the recording signals is suppressed due to a decrease in the high-frequency magnetic field c-Hac (Neg). Thereby, the quality of signals that are recorded to a recording medium is improved. As a result, the recording head and the HDD including the recording head that can achieve an increase in the recording density are obtained.
Third EmbodimentNext, descriptions regarding a recording head of an HDD according to a third embodiment are given.
A configuration of the recording head 58 of the HDD according to the third embodiment is mainly different from that of the recording head according to the first embodiment in that the recording head 58 according to the third embodiment includes a side shield. Other configurations thereof are the same as those of the recording head according to the first embodiment. The same reference numbers are given to portions that are the same in the first embodiment and their detailed descriptions are omitted.
As illustrated in
The pair of side shields 74 is formed of a high permeability material and is formed in an integrated manner with the tip part 62a of the write shield magnetic pole 62. The side shields 74 projects from the leading side end surface 62b of the tip part 62a toward the leading end side of the slider 42. Each side shield 74 extends from the leading side end surface of the write shield magnetic pole 62 to a level position, passing across the leading side end surface 60c of the main magnetic pole 60.
The spin torque oscillator 65 is arranged between the tip part of the main magnetic pole 60 and the tip part of the write shield magnetic pole 62. These are configured in the same manner as the first embodiment discussed above.
In the third embodiment configured as mentioned above, the deterioration of the recording signals is suppressed due to an decrease in the high-frequency magnetic field c-Hac (Neg). Thereby, the quality of signals that are recorded to a recording medium is improved. As a result, the recording head and the disk device including the recording head that can achieve an increase in the recording density are obtained.
Fourth EmbodimentNext, descriptions regarding a recording head of an HDD according to a fourth embodiment are given.
A configuration of the recording head 58 of the HDD according to the fourth embodiment is mainly different from that of the recording head according to the first embodiment in that the recording head 58 according to the fourth embodiment includes a leading shield magnetic pole and side shields. Other configurations thereof are the same as those of the recording head according to the first embodiment. The same reference numbers as those according to the first embodiment are given to portions the same as the corresponding portions of the above-described first embodiment and its detailed descriptions are omitted.
As illustrated in
The pair of side shields 74 is formed of a high permeability material, and is formed in an integrated manner with the tip part 62a of the write shield magnetic pole 62. The side shields 74 projects from the leading side end surface 62b of the tip part 62a toward the leading end side of the slider 42. Each side shield 74 extends from the leading side end surface of the write shield magnetic pole 62 to a level position, passing across the leading side end surface 60c of the main magnetic pole 60.
The leading shield magnetic pole 72 is formed substantially in an L-shape. The tip part 72a of the leading shield magnetic pole has an elongated rectangular shape. A tip surface of the leading shield magnetic pole 72 is exposed to the ABS 43 of the slider 42. A trailing side end surface 72b of the tip part 72a faces the leading side end surface 60c of the main magnetic pole 60 through a gap interposed therebetween. In addition, the trailing side end surface 72b joins the tip surfaces of the side shields 74. In the present embodiment, the leading shield magnetic pole 72 is formed of the soft magnetic material, and is formed in an integrated manner with the write shield magnetic pole 62 and the side shields 74.
Electrically insulating layers 61 and 75 are respectively arranged on the junction part 67 between the main magnetic pole 60 and the write shield magnetic pole 62 and on the junction part 73 between the main magnetic pole 60 and the leading shield magnetic pole 72. Thereby, the main magnetic pole 60 and the write shield magnetic pole 62, and the main magnetic pole 60 and the leading shield magnetic pole 72 are respectively insulated from each other. Parts of the main magnetic pole 60 and the write shield magnetic pole 62 are respectively electrically connected to the drive terminal electrodes 63.
The spin torque oscillator 65 is arranged between the tip part of the main magnetic pole 60 and the tip part of the write shield magnetic pole 62. These are configured in the same manner as the first embodiment discussed above.
In the fourth embodiment configured as mentioned above, the deterioration of the recording signals is suppressed due to a decrease in the high-frequency magnetic field c-Hac (Neg). Thereby, the quality of signals that are recorded to a recording medium is improved. As a result, the recording head and the disk device including the recording head that can achieve an increase in the recording density are obtained.
These embodiments that have been described are not intended to limit the scope of the inventions to the way of presented example only. Indeed, the novel embodiments described herein may be embodied by modifying components without departing from the spirit of the inventions. An arbitral combination of plural components disclosed in the above-described embodiments may form various inventions. For example, some components may be eliminated from all of the components described in the embodiments. Furthermore, components according to different embodiments may be arbitrarily combined.
For example, it is possible to change the material, shape, size, and the like of elements configuring the head part as necessary. Also, it is possible to increase the number of magnetic disk and magnetic head in the magnetic disk device as necessary, and the size of magnetic disk may vary.
Claims
1. A recording head, comprising:
- a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer of a recording medium;
- a write shield magnetic pole disposed on a trailing side of the main magnetic pole with a write gap interposed therebetween; and
- a spin torque oscillator that is provided in the write gap between the main magnetic pole and the write shield magnetic pole and generates a high frequency magnetic field, wherein
- the main magnetic pole includes a trailing side end surface that faces the spin torque oscillator and extends so as to be tilted toward a leading side of the recording head with respect to the direction perpendicular to the recording layer of the recording medium, and
- the spin torque oscillator has one or more layers and the layers have tilted surfaces that are substantially in parallel with the trailing side end surface.
2. The recording head according to claim 1, wherein the write shield magnetic pole has a leading side end surface that faces the spin torque oscillator and extends so as to be tilted toward the leading side of the recording head with respect to the direction perpendicular to the recording layer of the recording medium to be substantially in parallel with the surfaces of the layers of the spin torque oscillator.
3. The recording head according to claim 2, wherein the main magnetic pole has a leading side end surface that is positioned on a side of the main magnetic pole that is opposite to the trailing side end surface and tilts toward the leading side of the recording head with respect to the direction perpendicular to the recording layer of the recording medium.
4. The recording head according to claim 1, wherein the main magnetic pole has a leading side end surface that is positioned on a side of the main magnetic pole that is opposite to the trailing side end surface and tilts toward the leading side of the recording head with respect to the direction perpendicular to the recording layer of the recording medium.
5. The recording head according to claim 1, further comprising:
- a junction part physically joining the main magnetic pole to the write shield magnetic pole, wherein the junction part includes an insulating layer electrically insulating the main magnetic pole from the write shield magnetic pole.
6. The recording head according to claim 1, further comprising:
- side shields arranged on both sides of the main magnetic pole in a track width direction to be magnetically separated from the main magnetic pole.
7. The recording head according to claim 6, further comprising:
- a leading shield magnetic pole that is disposed on a leading side of the main magnetic pole with a gap interposed therebetween and forms a magnetic circuit together with the main magnetic pole.
8. The recording head according to claim 1, further comprising:
- a leading shield magnetic pole that is disposed on a leading side of the main magnetic pole with a gap interposed therebetween and forms a magnetic circuit together with the main magnetic pole.
9. The recording head according to claim 8, wherein the leading shield magnetic pole, the side shields, and the write shield magnetic pole are formed in an integrated manner.
10. A recording head, comprising:
- a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer of a recording medium;
- a shield magnetic pole disposed on a trailing side of the main magnetic pole; and
- a spin torque oscillator configured to generate a high frequency magnetic field and disposed between the main magnetic pole and the shield magnetic pole,
- wherein the main magnetic pole has a side surface that faces the spin torque oscillator and is sloped with respect to an air bearing surface of the magnetic head, and the spin torque oscillator has one or more layers and the layers have surfaces that are sloped with respect to the air bearing surface of the magnetic head.
11. The recording head according to claim 10, wherein the side surface of the magnetic pole is closer to the air bearing surface of the magnetic head at a trailing end than a leading end.
12. The recording head according to claim 11, wherein the surfaces of the layers of the spin torque oscillator are substantially parallel to the side surface of the magnetic pole.
13. The recording head according to claim 11, further comprising:
- a junction part physically joining the main magnetic pole to the shield magnetic pole, wherein the junction part includes an insulating layer electrically insulating the main magnetic pole from the shield magnetic pole.
14. The recording head according to claim 11, further comprising:
- side shields arranged on both sides of the main magnetic pole in a track width direction to be magnetically separated from the main magnetic pole.
15. The recording head according to claim 14, further comprising:
- a leading shield magnetic pole that is disposed on a leading side of the main magnetic pole with a gap interposed therebetween and forms a magnetic circuit together with the main magnetic pole.
16. The recording head according to claim 11, further comprising:
- a leading shield magnetic pole that is disposed on a leading side of the main magnetic pole with a gap interposed therebetween and forms a magnetic circuit together with the main magnetic pole.
17. A disk device, comprising:
- a recording medium including a magnetic recording layer having magnetic anisotropy in a direction perpendicular to a medium surface;
- a driving part that rotates the recording medium; and
- a recording head including a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer of a recording medium, a shield magnetic pole disposed on a trailing side of the main magnetic pole, and a spin torque oscillator configured to generate a high frequency magnetic field and disposed between the main magnetic pole and the shield magnetic pole,
- wherein the main magnetic pole has a side surface that faces the spin torque oscillator and is sloped with respect to an air bearing surface of the magnetic head, and the spin torque oscillator has one or more layers and the layers have surfaces that are sloped with respect to the air bearing surface of the magnetic head.
18. The disk device according to claim 10, wherein the side surface of the magnetic pole is closer to the air bearing surface of the magnetic head at a trailing end than a leading end.
19. The disk device according to claim 18, wherein the surfaces of the layers of the spin torque oscillator are substantially parallel to the side surface of the magnetic pole.
20. The disk device according to claim 19, further comprising:
- side shields arranged on both sides of the main magnetic pole in a track width direction to be magnetically separated from the main magnetic pole; and
- a leading shield magnetic pole that is disposed on a leading side of the main magnetic pole with a gap interposed therebetween and forms a magnetic circuit together with the main magnetic pole,
- wherein the shield magnetic pole, the side shields, and the leading shield magnetic pole are formed in an integrated manner.
Type: Application
Filed: Oct 24, 2012
Publication Date: Nov 28, 2013
Inventors: Takuya Maatsumoto (Tokyo), Kenichiro Yamada (Tokyo), Noayuki Narita (Tokyo)
Application Number: 13/659,735
International Classification: G11B 5/187 (20060101);